Why any of my iPhone apps are not supporting my phone?

I got iPhone 3G and I need a few apps on my phone, for some reason any iPhone apps are not working. They are asking for updated software version. Is apple forcing me to buy a new iPhone? Or am I missing something here?

Added (1). My iPhone software is up to date iOS 4.2.1according to iTunes

Well update it and no you just need to authorize your phond to your computur

Officially, your iphone 3g can't be updated anymore but you can if you jailbreak your iphone and update via other means. Here's a tutorial.

http://www.whited00r.com/iphone3g.php

visit the site and click through the tutorials and steps on how to do it

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